Knowledge Base

C

Cipher Suite: TLS_­DH_­DSS_­WITH_­ARIA_­256_­CBC_­SHA384

Summary

Name:
TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384
IANA Name:
TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384
Code:
(0xc0, 0x3f)
OpenSSL Name:
Protocol Versions:
TLS 1.0,TLS 1.1,TLS 1.2

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Components

C
Key Exchange Method
Name
DH (Fixed Diffie-Hellman Ephemeral)
Security
Static Diffie-Hellman[429][430] is a variant of Diffie-Hellman[99][100][101][102][103] key exchange[133] protocol that has no forward secrecy[127][128][129][130], and does not protect past sessions against future compromises. If long-term secret keys or passwords are compromised, encrypted communications and sessions recorded in the past can be retrieved and decrypted.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server or replace the cipher suite with it's Ephemeral Diffie-Hellman[405][406][407][408] version.
C
Authentication Method
Name
DSS
Security
Digital Signature Algorithm[258][259][260][261][262][263] is a digital signature[107][108][109][110] algorithm, which is considered secure[264][265], but leading client applications do not use this algorithm. Unless your application or requirements specifically call for their use, it is generally safer to avoid cipher suites that are not adopted and supported by a critical mass of the industry.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
C
Encryption Type
Name
ARIA-256
Security
Encryption algorithm ARIA[313][314][315][316] is a block cipher[78][79][80][81] which is considered secure[317], but leading client applications do not use this algorithm. Unless your application or requirements specifically call for their use, it is generally safer to avoid cipher suites that are not adopted and supported by a critical mass of the industry.
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
B
Encryption Mode
Name
CBC
Security
Encryption mode is cipher block chaining[28][29][30]. It is vulnerable[31] to timing attack[188] (eg: Lucky Thirteen attack[11][12]) and padding oracle attack[63][64][65][66] (eg: POODLE attack[13][14][15]).
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server or at least set the cipher suite order explicitly and any cipher suite modes be preferred over ciphers suites with CBC modes.
A+
Encryption Key Size
Name
256
Security
The symmetric key[185][186][187] withkey size[184] more than 128 bits as it is should be according to National Institute of Standards and Technology[470][471] so it is not vulnerable to preimage attack[67] and it cannreliably prove that message came from the stated sender (its authenticity) and has not been changed, so connection is not open for a man-in-the-middle attack[61].
Recommendations
Remove the cipher suite from the list of cipher suites supported by your server.
A+
Encryption Block Size
Name
128
Security
The block cipher[78][79][80][81] uses a block size[87] larger than 64 bits, so it is not vulnerable to sweet32 attack[22][23][24][25].
Recommendations
A+
Message Authentication Code
Name
SHA2-384
Security
message authentication code[135][136][137][138] is a hashed message authentication code[139][140][141][142][143][144][145] which is considered secure. The underlaying cryptographic hash function[94][95][96][97] (Secure Hash Algorithm 2[212][213][214]) is also considered secure.
Recommendations
If your application or requirements specifically call for the use of a message authentication code[135][136][137][138] that does not provide authenticated encryption[74] prefer block cipher mode of operation[82][83][84][85][86] (eg: counter with CBC-MAC[32][33][34], Galois/Counter Mode[46][47][48][49] or message authentication code[135][136][137][138] (eg: Poly1305[458][459]) that proved authenticated encryption over the ones which does not provide it. In case of a hashed message authentication code[139][140][141][142][143][144][145] prefer message authentication code[135][136][137][138] based on Secure Hash Algorithm 2[212][213][214] over the ones based on Secure Hash Algorithm 1[202][203][204].